JPH06220294A - Filled modified propylene polymer composition - Google Patents

Abstract

PURPOSE:To obtain a polymer composition excellent in rigidity, heat distortion resistance, etc., by incorporating a specific amount of a filler into a modified propylene polymer obtained by grafting an aromatic vinyl by the melt-kneading polymerization method. CONSTITUTION:This polymer composition comprises 99-44wt.% modified propylene polymer and 1-60wt.% inorganic filler, especially glass filler. The polymer is the one obtained by grafting either an aromatic vinyl, especially styrene or an analogue thereof, or a mixture thereof with a vinyl monomer containing a polar functional group, e.g. silyl, carboxyl, or epoxy, onto a propylene polymer by the melt-kneading polymerization method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modified propylene polymer composition containing an inorganic filler, more specifically, rigidity,
The present invention relates to a modified propylene-based polymer composition containing an inorganic filler which is excellent in heat distortion resistance.

[0002]

2. Description of the Related Art Polypropylene is widely used as various molded products, films and the like because it is an inexpensive resin and has excellent mechanical strength, heat resistance, oil resistance and chemical resistance. However, since polypropylene has insufficient rigidity depending on its use, it cannot be used as it is for automobile parts, building materials and the like which require particularly high rigidity. In order to improve such rigidity, addition of inorganic fillers such as glass filler, calcium carbonate, silica, talc and clay has been carried out. However, since polypropylene does not have a polar group or a functional group in its molecular structure, it has no affinity with the inorganic filler, and merely filling the inorganic filler does not sufficiently improve the rigidity, and also has an impact strength. It tends to decrease.

Therefore, in order to improve the affinity with the inorganic filler, the propylene polymer is melt-kneaded and polymerized with an unsaturated carboxylic acid such as maleic acid, maleic anhydride or acrylic acid in the presence of a radical initiator. It has been proposed to use a propylene-based polymer modified by (for example, JP-A-48-47937 and JP-A-58-17).
No. 38).

However, since the propylene-based copolymer itself is a radical-disintegrating polymer, when the melt-kneading polymerization with an unsaturated carboxylic acid in the presence of a radical initiator, a decomposition reaction of the propylene-based polymer occurs. Therefore, there is a problem that the original physical properties are deteriorated. That is, when the amount of unsaturated carboxylic acid is increased to improve the affinity with the inorganic filler, it is necessary to increase the amount of the radical initiator, and the decomposition of the propylene-based polymer accompanying it causes a problem of reduction in heat distortion resistance and molecular weight. . On the contrary, if the addition amount of the radical initiator is reduced in order to suppress the decomposition of the propylene-based polymer, the reaction rate of the unsaturated carboxylic acid will decrease, and the affinity with the inorganic filler is insufficient. There's a problem. On the other hand, impact strength is also higher than that of a composition obtained by simply adding an inorganic filler to a propylene-based polymer,
At present, it cannot be said that it is excellent.

That is, a modified propylene polymer composition containing an inorganic filler, which has a good affinity with the inorganic filler, and is excellent in rigidity and resistance to thermal deformation, and a modified propylene polymer composition containing an inorganic filler with improved impact resistance. No polymer composition has been found to date.

Therefore, a modified propylene polymer composition containing an inorganic filler, which has a good affinity with the inorganic filler and is excellent in rigidity and heat distortion resistance, and a modified propylene polymer composition containing an inorganic filler, which is excellent in impact resistance. If the product can be obtained, the applications of the propylene-based polymer can be dramatically expanded.

[0007]

The problem to be solved by the present invention is, firstly, a modified propylene polymer composition containing an inorganic filler, which has good affinity with the inorganic filler, rigidity, and heat distortion resistance. Secondly, to provide a modified propylene polymer composition containing an inorganic filler, which is excellent in impact resistance in addition to the above properties.

[0008]

The present invention is a modified propylene-based polymer obtained by melt-kneading polymerization reaction of an aromatic vinyl monomer in the presence of a molten propylene-based polymer in an amount of 99 to 40% by weight. And 1 to 60% by weight of an inorganic filler, and a modified propylene polymer composition containing an inorganic filler, and an aromatic vinyl monomer and a vinyl containing a polar functional group in the presence of a propylene polymer in a molten state. Modified propylene polymer 99-40 obtained by melt-kneading polymerization reaction of monomers, especially vinyl monomers containing silyl group, carboxyl group or epoxy group
An inorganic filler-containing modified propylene-based polymer composition characterized by comprising 1% to 60% by weight of an inorganic filler and an inorganic filler-containing modified propylene-based polymer composition. .

According to the knowledge of the present inventors, the aromatic vinyl monomer or the monomer and the polar functional group-containing vinyl monomer are melt-kneaded and polymerized in the presence of a propylene polymer in a molten state. An inorganic filler-containing modified propylene-based polymer composition prepared by mixing an inorganic filler into the modified propylene-based polymer thus obtained has good affinity with the inorganic filler, and has significantly excellent rigidity and heat distortion resistance. There is.

Further, a modified propylene polymer obtained by melt-kneading polymerization reaction of an aromatic vinyl monomer in the presence of a propylene polymer in a molten state, or an aromatic vinyl monomer and a polar functional group-containing Vinyl monomer, particularly a modified propylene-based polymer composition containing a glass filler in a modified propylene-based polymer obtained by melt-kneading polymerization reaction of a silyl group-containing vinyl monomer is remarkably unprecedented. Has excellent impact resistance.

[0011]

[Structure] The propylene-based polymer used in the present invention is
It refers to a propylene homopolymer and a copolymer of propylene with other olefins or ethylenic vinyl monomers, and the propylene content in the copolymer is preferably 75% or more. Specific examples include homopolypropylene, propylene-ethylene copolymer, propylene-ethylene-butene copolymer, propylene-butene copolymer and the like. These propylene-based copolymers may be used alone or in combination of two or more.

Aromatic vinyl monomers used in the present invention are typically styrene, methylstyrene, vinylstyrene, vinylxylene, ethylvinylbenzene, isopropylstyrene, chlorostyrene, dichlorostyrene, bromostyrene, etc. Can be used, and these may be used alone or in combination of two or more. As such a monomer, a styrene compound is preferable.

Examples of the polar functional group-containing vinyl monomer used in the present invention include the following.
For example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltributoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, vinyltris (2-
Silyl group-containing vinyl monomers such as (methoxyethoxy) silane, for example, acrylic acid, methacrylic acid, itaconic acid,
Maleic acid, carboxyl group-containing vinyl monomers such as maleic anhydride, for example, epoxy group-containing vinyl monomers such as glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, methacryl glycidyl ether, and the like, these are independent. May be used, or two or more kinds may be mixed and used.

The amount of the aromatic vinyl monomer used in the present invention is preferably 35% by weight or less, more preferably 2 to 20% by weight based on the propylene polymer. When the amount of the aromatic vinyl monomer added is in the above range, the properties as a propylene-based polymer are not impaired and the effect of modification is exhibited, which is preferable.

Further, since the aromatic vinyl monomer has both the effect of preventing the modified propylene polymer from having a low molecular weight and the effect of improving the affinity with the inorganic filler, the polar functional group-containing vinyl monomer is used. When used together with the aromatic vinyl monomer, it is preferable that the aromatic vinyl monomer is added in an amount of at least equimolar or more, preferably 1 to 5 times the molar amount of the polar functional group-containing vinyl monomer. good.

The amount of the polar functional group-containing vinyl monomer used in the present invention is preferably 10% by weight or less, more preferably 1 to 5% by weight based on the propylene polymer.
The addition amount of such a monomer is preferably in the above range because the effect of the present invention is better exhibited.

The modified propylene-based polymer used in the present invention is usually obtained by adding a radical initiator in the presence of a propylene-based polymer in a molten state to obtain an aromatic vinyl monomer or the monomer and a polar functional group. It is produced by subjecting the contained vinyl monomer to a melt-kneading polymerization reaction.

As the above-mentioned radical initiator, since the melt-kneading polymerization reaction is carried out at the melting temperature of the propylene-based polymer or higher, the temperature for obtaining a half-life of 1 minute is 130 to 2
Radical initiators that are at 50 ° C. are preferred. In particular,
Tert-butyl peroctoate, tert-butyl perbenzoate, benzoyl peroxide,
2,4-dichlorobenzoyl peroxide, 1,1-
Ditertiary butyl peroxy-3,3,5-trimethylcyclohexane, tert-butyl peroxy isopropyl carbonate, dicumyl peroxide,
2,5-Dimethyl-2,5-di- (tert-butylperoxy) hexane, α, α'-bis- (tert-butylperoxyisopropyl) benzene, 2,5-
Dimethyl-2,5-di- (tert-butylperoxy) hexyne-3, di-tert-butylperoxide, 1,6-bis (tert-butylperoxycarbonoxy) hexane, 1,1-di-tert-butylperoxide Examples thereof include organic peroxides such as oxycyclohexane and tert-butyl cumyl peroxide. These may be used alone or in combination of two or more. The amount of radical initiator added is
Usually, it is 0.1 with respect to the total amount of vinyl monomers used in the present invention.
It is preferably 10 to 10% by weight, more preferably 1 to 5% by weight.

Further, since the propylene-based polymer used in producing the modified propylene-based polymer is a radical-disintegrating polymer, a stabilizer is required, and the aromatic vinyl monomer and polar functional group used in the present invention are required. It is necessary to consider the kind and addition amount so as not to hinder the polymerization of the contained vinyl monomer. Typical of such stabilizers are pentaerythrityl-tetrakis (ditertiarybutylhydroxyphenyl) propionate, octadecyl (ditertiarybutylhydroxyphenyl) propionate, thiobis (methyl-tertiarybutylphenol), trimethyl-tris (ditertiary). Hindered phenolic stabilizers such as sharybutylhydroxybenzyl) benzene, phosphorus stabilizers such as tetrakis (ditertiarybutylphenyl) biphenylenephosphite, tris (ditertiarybutylphenyl) phosphite, zinc stearate, calcium stearate. Examples of such metal soaps, magnesium oxide, acid acceptors such as hydrotalcite, and the like. These may be used alone or in combination of two or more. The amount of the stabilizer added is usually 0.01 to 1% by weight, preferably 0.05 to 1% by weight, based on the propylene polymer.
It is 0.5% by weight.

The inorganic filler used in the present invention is
Powder that is generally used for strengthening various plastics,
It refers to a granular or fibrous inorganic filler, and specific examples thereof include glass filler, talc, silica, clay, mica, calcium carbonate, magnesium carbonate, calcium silicate, magnesium hydroxide, and aluminum hydroxide. As the glass filler, glass roving, glass chopped strand, glass milled fiber, etc. are used. These may be used alone or in combination of two or more. Also,
These inorganic fillers may be surface-treated with a fatty acid, a resin acid, a silane compound or the like.

The content of the inorganic filler in the composition of the present invention is preferably 1 to 60% by weight, more preferably 10 to 30% by weight, based on the whole composition. When the content of the inorganic filler is less than 1% by weight, the effect of improving the rigidity and impact strength of the obtained modified propylene polymer composition containing the inorganic filler is insufficient, and when it exceeds 60% by weight, the physical properties of the composition are reversed. Or the kneading work in an extruder or the like becomes difficult, which is not preferable.

The modified propylene polymer composition containing an inorganic filler of the present invention can be produced using a Banbury mixer, a pressure kneader, a closed mixer such as a universal mixer, a kneading extruder or the like. The kneading of the modified propylene-based polymer of the present invention and the inorganic filler is usually 160-
It is carried out at a temperature of 250 ° C., and the kneading time is usually 2 to 15 minutes.

Since polypropylene does not have a polar group or a functional group in its molecular structure as described above, it has no affinity with an inorganic filler. However, the modified propylene-based polymer of the present invention has a functional group, and since the affinity with the inorganic filler is remarkably improved by this functional group, the modified propylene-based polymer composition containing the inorganic filler of the present invention is excellent. Excellent rigidity and heat distortion resistance can be exhibited.

The modified propylene polymer composition containing an inorganic filler of the present invention has a good affinity with the inorganic filler and is excellent in rigidity and heat distortion resistance. Particularly, the modified propylene polymer composition containing a glass filler is more resistant to impact. It has excellent properties and can be widely used in applications such as automobile parts, electric appliances, industrial products, and building materials that require high rigidity, heat resistance, or impact resistance.

[0025]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples. However, the present invention is not limited to the following examples and comparative examples.

Reference Example 1 Made by Brabender, Germany 2
A 0 mm twin-screw extruder was set so that the feeder temperature was 190 ° C, the barrel temperature was 210 ° C, and the die temperature was 230 ° C. Polypropylene powder "Hipol B200
P "(manufactured by Mitsui Petrochemical Industry Co., Ltd.) and 930 parts by weight of" Irganox 1010 "(stabilizer manufactured by Ciba Geigy) 0.4
8 parts by weight, 0.95 part by weight of "phosphite 168" (stabilizer manufactured by Ciba-Geigy) and 0.48 part by weight of calcium stearate were added and mixed by a Henschel mixer. This polypropylene compound is hereinafter referred to as "stabilizer compounding PP". 150 parts by weight of styrene and 1 part by weight of "Perhexin 2.5B" (a radical initiator manufactured by NOF CORPORATION) were added to 850 parts by weight of "PP containing stabilizer", and the mixture was thoroughly mixed and impregnated with a Henschel mixer. The obtained impregnated blend is supplied to the above extruder, and the screw rotation speed is 30 rpm.
The melt-kneading reaction was carried out to obtain extrudate pellets. Hereinafter, this is referred to as "modified PP (1)".

Reference Example 2 Made by Brabender, Germany 2
A 0 mm twin-screw extruder was set so that the feeder temperature was 165 ° C, the barrel temperature was 186 ° C, and the die temperature was 210 ° C. "Stabilizer blended PP" 920 parts by weight with styrene 5
0 parts by weight, 30 parts by weight of glycidyl methacrylate and "Perhexin 2.5B" (radical initiator manufactured by NOF CORPORATION)
1 part by weight was added and thoroughly mixed and impregnated with a Henschel mixer. The resulting impregnated blend is fed to the extruder,
Melt kneading reaction was performed at a screw rotation speed of 25 rpm to obtain extruded product pellets. Hereinafter, this is referred to as "modified PP (2)".

(Reference Example 3) 2 manufactured by Brabender in Germany
A 0 mm twin-screw extruder was set so that the feeder temperature was 165 ° C, the barrel temperature was 186 ° C, and the die temperature was 210 ° C. "Stabilizer blended PP" 920 parts by weight with styrene 5
0 parts by weight, 30 parts by weight of methacrylic acid and 1 part by weight of "Perhexin 2.5B" (a radical initiator manufactured by NOF CORPORATION) were added and thoroughly mixed and impregnated with a Henschel mixer. The obtained impregnated blended product was supplied to the above extruder and melt-kneaded at a screw rotation speed of 25 rpm to obtain extruded product pellets. Hereinafter, this is referred to as "modified PP (3)".

Reference Example 4 Made by Brabender, Germany 2
A 0 mm twin-screw extruder was set so that the feeder temperature was 165 ° C, the barrel temperature was 186 ° C, and the die temperature was 210 ° C. "Stabilizer blended PP" 930 parts by weight of styrene 5
0 parts by weight, 20 parts by weight of 3-methacryloxypropyltrimethoxysilane and 1 part by weight of "Perhexin 2.5B" (radical initiator manufactured by NOF CORPORATION) were added and thoroughly mixed and impregnated with a Henschel mixer. The obtained impregnated blended product was supplied to the above extruder and melt-kneaded at a screw rotation speed of 25 rpm to obtain extruded product pellets. Hereinafter, this is referred to as "modified PP (4)".

Example 1 A Brabender Plastograph roller mixer manufactured by Brabender, Germany was set so that the temperature of the mixer section was 200 ° C. Reference example 1
36 parts by weight of "modified PP (1)" obtained in 1 and 9 parts by weight of talc SW (manufactured by Nippon Talc Co., Ltd.) were supplied to the mixer and kneaded at a rotation speed of 40 rpm for 5 minutes. The obtained melt-kneaded product was heated at 190 ° C. for 15 minutes using a hydraulic press.
Molding was performed under the condition of 0 kg / cm ² to obtain a test piece having a thickness of 1 mm. The viscoelasticity of the test piece was measured by “Rheometrics RSA1
1 "(manufactured by Rheometrics) is measured from room temperature to 200 ° C. under the condition of 6.28 radians / second, and the dynamic elastic modulus at 30 ° C. is calculated as the rigidity, and at the same time, the dynamic deformation of heat resistance is measured. Elastic modulus is 3.0 × 10 ⁹ dy
The temperature at which ne / cm ² or less was obtained. The results of physical property measurements are shown in Table 1. Further, when the affinity of talc was observed with a scanning electron microscope (MSM-9 manufactured by Hitachi, Ltd.) on the fracture surface of the sample, it was observed that the talc and the resin were in close contact with each other, and the affinity was improved. I found out that

(Comparative Example 1) In Example 1, "modified PP
(1) Instead of using 36 parts by weight of "Stabilizer formulation P"
A sample was obtained in the same manner as in Example 1 except that 36 parts by weight of "P" was used. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 1. Further, when the fracture surface of the test piece was observed for the affinity of talc with a scanning electron microscope (MSM-9 manufactured by Hitachi, Ltd.) in the same manner as in Example 1, it was observed that talc fell out of the resin. It was found that the affinity was low.

(Example 2) In Example 1, the "modified P
Instead of using 36 parts by weight of "P (1)", 36 parts by weight of "modified PP (3)" obtained in Reference Example 3 was used, and talc SW was used.
A test piece was obtained in the same manner as in Example 1 except that 9 parts by weight of calcium carbonate NCC # 410 (manufactured by Nitto Koka Kogyo Co., Ltd.) was used instead of 9 parts by weight (made by Nippon Talc Co., Ltd.). Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 1. Further, the fracture surface of the test piece was observed with a scanning electron microscope (MSM-9 manufactured by Hitachi, Ltd.) in the same manner as in Example 1, and it was found that the calcium carbonate and the resin were in close contact with each other. Was observed, and it was found that the affinity was improved.

(Comparative Example 2) In Example 1, the "modified P
Instead of using 36 parts by weight of "P (1)", "Admar QF
540 "(carboxylic acid-modified polypropylene manufactured by Mitsui Petrochemical Industry Co., Ltd.) 36 parts by weight, and calcium carbonate NC instead of 9 parts by weight of talc SW (manufactured by Nippon Talc)
A sample was obtained in the same manner as in Example 1 except that 9 parts by weight of C # 410 (manufactured by Nitto Koka Kogyo Co., Ltd.) was used. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 1. Further, the fracture surface of the sample was subjected to a scanning electron microscope (MSM-manufactured by Hitachi Ltd.) in the same manner as in Example 1.
As a result of observing the affinity of calcium carbonate according to 9), it was observed that calcium carbonate was almost completely removed from the resin, and it was found that the affinity was considerably low.

(Example 3) In Example 1, the "modified P
Instead of using 36 parts by weight of P (1) ”, 36 parts by weight of“ modified PP (2) ”obtained in Reference Example 2 was used.
(Manufactured by Nippon Talc Co.) silica instead of 9 parts by weight
A test piece was obtained in the same manner as in Example 1 except that 9 parts by weight of Carplex # 80 (manufactured by Shionogi) was used. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 2. Further, the fracture surface of the sample was made to be the same as in Example 1 by using a scanning electron microscope (M manufactured by Hitachi, Ltd.).
When the affinity of silica was observed by SM-9),
It was observed that the silica and the resin were in close contact, and it was found that the affinity was improved.

(Example 4) In Example 1, "modified P
Instead of using 36 parts by weight of "P (1)", 36 parts by weight of "modified PP (4)" obtained in Reference Example 4 was used, and talc SW was used.
(Manufactured by Nippon Talc Co.) silica instead of 9 parts by weight
A test piece was obtained in the same manner as in Example 1 except that 9 parts by weight of Carplex # 80 (manufactured by Shionogi) was used. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 2. Further, the fracture surface of the test piece was made to be the same as in Example 1 by using a scanning electron microscope (manufactured by Hitachi Ltd.).
As a result of observing the affinity of silica by MSM-9), it was observed that the silica and the resin were in close contact, and it was found that the affinity was improved.

(Comparative Example 3) In Example 1, "modified P
Instead of using 36 parts by weight of "P (1)", "Admar QF
540 "(carboxylic acid-modified polypropylene manufactured by Mitsui Petrochemical Co., Ltd.), and 9 parts by weight of silica carplex # 80 (manufactured by Shionogi) instead of 9 parts by weight of talc SW (manufactured by Nippon Talc). The same operation as in Example 1 was carried out except that the test pieces were obtained. Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of physical property measurements are shown in Table 2.
It was shown to. Further, when the affinity of silica was observed with a scanning electron microscope (MSM-9 manufactured by Hitachi, Ltd.) on the fracture surface of the sample in the same manner as in Example 1, it was observed that silica was almost removed from the resin. It was found that the affinity was considerably low.

(Example 5) In Example 1, the "modified P
Instead of using 36 parts by weight of P (1) ”, 36 parts by weight of“ modified PP (2) ”obtained in Reference Example 2 was used.
A sample was obtained by performing the same operation as in Example 1 except that 9 parts by weight of glass powder M50S (manufactured by Nippon Fellow) was used instead of 9 parts by weight (manufactured by Nippon Talc). Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of measuring the physical properties are shown in Table 3. Further, the fracture surface of the sample was made to be the same as in Example 1 by using a scanning electron microscope (MSM manufactured by Hitachi, Ltd.).
As a result of observing the affinity of the glass by -9), it was found that the glass and the resin were in close contact, and the affinity was improved.

(Example 6) In Example 1, the "modified P
Instead of using 36 parts by weight of "P (1)", 36 parts by weight of "modified PP (3)" obtained in Reference Example 3 was used, and talc SW was used.
A sample was obtained by performing the same operation as in Example 1 except that 9 parts by weight of glass powder M50S (manufactured by Nippon Fellow) was used instead of 9 parts by weight (manufactured by Nippon Talc). Thereafter, the physical properties were evaluated in the same manner as in Example 1. The results of measuring the physical properties are shown in Table 3. Further, the fracture surface of the sample was made to be the same as in Example 1 by using a scanning electron microscope (MSM manufactured by Hitachi, Ltd.).
As a result of observing the affinity of the glass by -9), it was found that the glass and the resin were in close contact, and the affinity was improved.

(Comparative Example 4) In Example 1, "modified PP
(1) Instead of using 36 parts by weight of "Stabilizer formulation P"
P ”36 parts by weight, talc SW (manufactured by Nippon Talc Co., Ltd.)
A test piece was obtained by performing the same operation as in Example 1 except that 9 parts by weight of glass powder M50S (manufactured by Nippon Fellow) was used instead of 9 parts by weight. Thereafter, in the same manner as in Example 1,
The physical properties were evaluated. The results of measuring the physical properties are shown in Table 3. The affinity of the glass was observed with a scanning electron microscope (MSM-9 manufactured by Hitachi, Ltd.) on the fracture surface of the test piece in the same manner as in Example 1, and it was observed that the glass fell out of the resin. It was found that the affinity was low.

[0040]

[Table 1] (Note) The unit of compounding amount is parts by weight.

[0041]

[Table 2] (Note) The unit of compounding amount is parts by weight.

[0042]

[Table 3] (Note) The unit of compounding amount is parts by weight.

From the results shown in Tables 1 to 3, the modified propylene polymer composition containing an inorganic filler of the present invention has higher rigidity and heat resistance than the conventional polypropylene composition containing an inorganic filler and the carboxylic acid modified polypropylene composition containing an inorganic filler. It is obvious that the deformability is remarkably excellent.

Example 7 In Example 1, talc S
A sample was obtained in the same manner as in Example 1 except that 9 parts by weight of glass powder M50S (manufactured by Nippon Fellow) was used instead of 9 parts by weight of W (manufactured by Nippon Talc). The obtained test piece was evaluated for impact resistance at 23 ° C. using a falling weight impact tester. The impact resistance was determined as the falling weight impact strength, which is the minimum height at which a weight of 500 g is dropped on a test piece and the test piece breaks. The results are shown in Table 4.

(Example 8) In Example 1, "modified P
Instead of using 36 parts by weight of "P (1)", 36 parts by weight of "modified PP (4)" obtained in Reference Example 4 was used, and talc SW was used.
A sample was obtained in the same manner as in Example 1 except that 9 parts by weight of glass powder M50S (manufactured by Nippon Fellow) was used instead of 9 parts by weight (manufactured by Nippon Talc). The obtained test piece was evaluated for impact resistance at 23 ° C. using a falling weight impact tester. The impact resistance was determined as the falling weight impact strength, which is the minimum height at which a weight of 500 g is dropped on a test piece and the test piece breaks. The results are shown in Table 4.

(Comparative Example 6) In Example 1, "modified P
Instead of using 36 parts by weight of "P (1)", "stabilizer-containing P"
P ”36 parts by weight, talc SW (manufactured by Nippon Talc Co., Ltd.)
A test piece was obtained by performing the same operation as in Example 1 except that 9 parts by weight of glass powder M50S (manufactured by Nippon Fellow) was used instead of 9 parts by weight. The obtained test piece was evaluated for impact resistance at 23 ° C. using a falling weight impact tester. The impact resistance was determined as the falling weight impact strength, which is the minimum height at which a weight of 500 g is dropped on a test piece and the test piece breaks. The results are shown in Table 4.

(Comparative Example 7) In Example 1, the "modified P
Instead of using 36 parts by weight of "P (1)", "Admar QF
540 "(carboxylic acid-modified polypropylene manufactured by Mitsui Petrochemical Co., Ltd.), and glass powder M50S instead of 9 parts by weight of talc SW (manufactured by Nippon Talc Co., Ltd.).
Example 1 except that 9 parts by weight (manufactured by Nippon Fellow) was used.
A similar operation was performed to obtain a test piece. The obtained test piece was evaluated for impact resistance at 23 ° C. using a falling weight impact tester. The impact resistance was determined as the falling weight impact strength, which is the minimum height at which a weight of 500 g is dropped on a test piece and the test piece breaks. The results are shown in Table 4.

[0048]

[Table 4] (Note) The unit of compounding amount is parts by weight.

From the results shown in Table 4, the glass filler-containing modified propylene polymer composition of the present invention is remarkably excellent in impact resistance as compared with the conventional glass filler-containing polypropylene composition and glass filler-containing carboxylic acid-modified polypropylene composition. It is clear that it is excellent.

[0050]

Industrial Applicability The modified propylene polymer composition containing an inorganic filler of the present invention has good affinity with an inorganic filler, excellent rigidity, and excellent heat distortion resistance. Particularly, a modified propylene polymer composition containing a glass filler is It has excellent impact resistance.

Claims (8)

[Claims] 1. A modified propylene-based polymer obtained by melt-kneading polymerization reaction of an aromatic vinyl monomer in the presence of a propylene-based polymer in a molten state, in an amount of 99 to 40% by weight and an inorganic filler in an amount of 1 to 60% by weight. A modified propylene-based polymer composition containing an inorganic filler. 2. A modified propylene-based polymer obtained by melt-kneading polymerization reaction of an aromatic vinyl monomer and a polar functional group-containing vinyl monomer in the presence of a molten propylene-based polymer in an amount of 99 to 40 parts by weight. % And inorganic filler 1-60
A modified propylene-based polymer composition containing an inorganic filler, wherein the modified propylene-based polymer composition comprises an inorganic filler. 3. The polymer composition according to claim 1, which contains an inorganic filler in an amount of 10 to 30% by weight. 4. The polymer composition according to claim 1, 2 or 3, wherein the inorganic filler is a glass filler. 5. The polymer composition according to claim 1 or 2, wherein the aromatic vinyl monomer is a styrene compound. 6. The modified propylene polymer composition containing an inorganic filler according to claim 2, wherein the polar functional group-containing vinyl monomer is a silyl group-containing vinyl monomer. 7. The polar functional group-containing vinyl monomer is a carboxyl group-containing vinyl monomer.
The modified propylene-based polymer composition containing the inorganic filler described. 8. The modified propylene polymer composition containing an inorganic filler according to claim 2, wherein the polar functional group-containing vinyl monomer is an epoxy group-containing vinyl monomer.